Ong Be (native pronunciation: [ʔɑŋ˧ɓe˧]), also known as Bê, or Vo Limgao (臨高, Lin'gao) in Chinese, is a language spoken by 600,000 people, 100,000 of them monolingual, on the north-central coast of Hainan Island, including the suburbs of the provincial capital Haikou. The language is taught in primary schools and broadcast on the radio. Ong Be is a Tai–Kadai language, but it has no close relatives and its relationship within that family has not been determined.[3]

^Ethnologue classifies Ong Be with the Tai and Kam–Sui languages based on shared vocabulary. However, this is negative evidence, perhaps due to lexical replacement in other branches of the family, and morphological evidence suggests that the Tai and Kam–Sui languages are closer to the Hlai and Kra languages, respectively. The place of Ong Be in this scheme is unknown.